Abstract
The purpose of the work was to examine the reasons for formation of non-deformable non-metallic inclusions in rail steel and ways to reduce the rejection of finished rails due to the defects revealed during ultrasonic testing. The study was conducted at the steelmaking plant of JSC “Ural Steel”. In the central laboratory of the combine, a chemical analysis of non-metallic inclusions was carried out in the samples of finished rails produced from blanks manufactured by JSC “Ural Steel” and rejected at the ultrasonic test unit during the rail production at the “Aktobe Rail and Section Works” LLP. Non-metallic inclusions by their composition are represented by aluminium oxides. The most probable reasons for their formation have been determined as following: the use of aluminium containing ferroalloys and interaction of the melt components with refractory materials and casting powder. The authors made analysis of the ferroalloys used in production of rail steel. Industrial trials of the manufacturing process of continuously cast blanks from rail steel were carried out, where FS65 ferrosilicon, which contains aluminium, was replaced with silicon carbide. An increasing degree of silicon and carbon recovery in trial heats was noted. Evaluation of contamination with non-metallic inclusions and mechanical properties of the rail steel manufactured using the experimental technology showed that the service characteristics of the rail steel meet requirements of the state standard GOST R 51685 – 2013. The full-scale experiment has confirmed that the technology of alloying E76F rail steel with silicon carbide at JSC “Ural Steel” is technically feasible. The yield of 100-meter rails was increased by 17 % on a trial batch produced from JSC “Ural Steel” continuously cast blanks.
Highlights
Железнодорожный транспорт России – одна из важнейших базовых отраслей экономики
The yield of 100-meter rails was increased by 17 % on a trial batch produced from JSC “Ural Steel” continuously cast blanks
(Eng.), Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection, National University of Science and Technology “MISIS”, Head of the Laboratory of Materials Diagnostics, Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences ORCID: 0000-0002-5669-4262
Summary
Целью данного исследования являлось изучение причин образования недеформируемых неметаллических включений в рельсовой стали и пути снижения отбраковки готовых рельсов по дефектам ультразвукового контроля. В центральной заводской лаборатории комбината был проведен химический анализ неметаллических включений в образцах готовых рельсов, отбракованных на установке ультразвукового контроля при производстве рельсов ТОО «Актюбинский рельсобалочный завод» из заготовки производства АО «Уральская Сталь». Произведено промышленное опробование технологии производства непрерывнолитой заготовки рельсовой стали с заменой ферросилиция марки ФС65, имеющего в своем составе алюминий, на карбид кремния. Промышленным экспериментом подтверждено, что технология легирования карбидом кремния рельсовой стали Э76Ф в условиях АО «Уральская Сталь» технически возможна. Для цитирования: Григорьев А.М., Кузнецов М.С., Шепелев Д.С., Алексеев Е.М., Григорович К.В. Оптимизация технологии производства непрерывнолитой заготовки рельсовой стали с целью повышения чистоты по неметаллическим включениям // Известия вузов.
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